[clang] Add support for builtin_verbose_trap (PR #79230)

[Akira Hatanaka via cfe-commits]

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+// RUN: %clang_cc1 -triple arm64-apple-ios -std=c++20 -emit-llvm -debug-info-kind=limited %s -o - | FileCheck %s
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ahatanak wrote:

https://llvm.org/docs/TestingGuide.html#best-practices-for-regression-tests recommends we run a minimal set of passes. As @pogo59 said, I think we should add a separate LLVM test if we want to test the merging behavior.

https://github.com/llvm/llvm-project/pull/79230